Blowing, polish up fiddle (8)

I believe the answer is:

bursting

'blowing' is the definition.

'polish up fiddle' is the wordplay.
'polish' becomes 'rub' (polish meaning rub to make shiny).
'up' is a reversal indicator (in down clue: letters go upwards).
'fiddle' becomes 'sting' (both can refer to a scam).
'rub' reversed gives 'bur'.
'bur'+'sting'='BURSTING'

(Another definition for bursting that I've seen is " Breaking open suddenly and violently".)

I've seen this clue in The Telegraph.

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